In some of the levels when there are lots of enemies on screen the game starts to lag really bad. I was playing with a friend on a 50 inch TV through HDMI but then later switched backed to my primary monitor and it lagged but not as bad. I dont think its my graphics card (GTX 570) but it could be. when the lag starts itll incrementally get worse up to a point of it being a slideshow. Im curious to know if anyone else is getting the same lag. Thanks!

does your primary monitor have less pixels than the 50 inch? processing is often the bottleneck. graphics processing units and motherboard processers are often the bottleneck. if you want a bigger screen, try lowering or disabling shadow effects. If that does'nt do it, try lowering framrates. after that, lower other graphic settings.

Well when i went back to my desktop monitor, it lagged less but still occured, and for lowering the graphics, the only thing you can do is change the resolution since this game is a straight console port.